mark vs check out

mark is a noun but check out is not a noun.

Word	Noun	Adjective	Verb	Adverb
mark	Yes	No	Yes	No
check out	No	No	Yes	No

mark (noun)	check out (noun)
something that exactly succeeds in achieving its goal
an indication of damage
a marking that consists of lines that cross each other
the impression created by doing something unusual or extraordinary that people notice and remember
a number or letter indicating quality (especially of a student's performance)
a written or printed symbol (as for punctuation)
a symbol of disgrace or infamy
a distinguishing symbol
a visible indication made on a surface
a reference point to shoot at
a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
a person who is gullible and easy to take advantage of
formerly the basic unit of money in Germany

mark (verb)	check out (verb)
make or leave a mark on	examine so as to determine accuracy, quality, or condition
insert punctuation marks into	announce one's departure from a hotel
assign a grade or rank to, according to one's evaluation	try to learn someone's opinions and intentions
celebrate by some ceremony or observation	record, add up, and receive payment for items purchased
put a check mark on or near or next to	withdraw money by writing a check
be a distinctive feature, attribute, or trait; sometimes in a very positive sense	trace
make underscoring marks	be verified or confirmed; pass inspection
remove from a list
designate as if by a mark
establish as the highest level or best performance
make small marks into the surface of
mark with a scar
attach a tag or label to
notice or perceive
to accuse or condemn or openly or formally or brand as disgraceful